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Thyroid dysfunction in multi-transfused iron loaded thalassemia patients.

M B Agarwal1, S Shah, C Vishwanathan

  • 1Department of Hematology, L.T.M.G. Hospital, Sion, Bombay.

Indian Pediatrics
|August 1, 1992
PubMed
Summary

Iron overload in thalassemia patients frequently causes thyroid dysfunction, with 19.4% developing hypothyroidism. This thyroid failure may stem from chronic hypoxia, liver issues, and iron accumulation.

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Area of Science:

  • Endocrinology
  • Hematology
  • Internal Medicine

Background:

  • Thalassemia is a genetic blood disorder requiring frequent blood transfusions.
  • Transfusion-dependent patients develop iron overload, a condition with potential systemic complications.
  • Thyroid dysfunction is a recognized complication in chronic diseases, including iron overload states.

Purpose of the Study:

  • To investigate the prevalence and characteristics of thyroid dysfunction in transfusion-dependent iron-loaded thalassemia patients.
  • To assess the relationship between thyroid function and factors like age, blood transfusion history, liver function, and iron load.

Main Methods:

  • Studied 72 transfusion-dependent iron-loaded thalassemia patients.
  • Measured circulating thyroid hormones (T4, T3) and basal thyroid stimulating hormone (TSH).

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  • Assessed liver function biochemically and quantified iron overload using serum ferritin levels.

    • Main Results:

    • Thyroid failure (hypothyroidism) was observed in 14 patients (19.4%).
    • Patients were categorized into normal thyroid function (80.6%), compensated hypothyroidism (12.5%), and decompensated hypothyroidism (6.9%).
    • Impaired thyroid function did not correlate with age, blood transfusion volume, liver dysfunction, or iron overload severity.

    Conclusions:

    • Thyroid dysfunction is a significant complication in iron-loaded thalassemia.
    • The exact mechanisms are unclear, but a combination of chronic hypoxia, liver dysfunction, and iron overload is hypothesized to cause thyroid damage.
    • Further research is needed to elucidate the interplay of these factors and develop targeted interventions.